US20030020361A1 - Expandable flat winding for rotating electric machine fields - Google Patents
Expandable flat winding for rotating electric machine fields Download PDFInfo
- Publication number
- US20030020361A1 US20030020361A1 US10/254,727 US25472702A US2003020361A1 US 20030020361 A1 US20030020361 A1 US 20030020361A1 US 25472702 A US25472702 A US 25472702A US 2003020361 A1 US2003020361 A1 US 2003020361A1
- Authority
- US
- United States
- Prior art keywords
- winding
- flat field
- winding module
- electric machine
- rotor body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/527—Fastening salient pole windings or connections thereto applicable to rotors only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
- Y10T29/49012—Rotor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
Definitions
- the present invention relates to rotational electric machines and, more particularly, to a multi-piece two-pole generator rotor including flat for machine fields.
- the rotor In electric machines having a rotor and a stator, the rotor is provided with field windings, and the stator is provided with armature windings.
- the rotor is typically provided with rotor spindles to effect rotation. With this structure, however, the spindles on each end of the rotor body require the ends of the field winding to be formed into an arc concentric with the spindle. See, e.g., FIG. 1.
- This rotor construction including a one-piece rotor forging and end winding modules having curved ends is described in co-pending U.S. patent application Ser. No. 09/491,504, filed Jan. 26, 2000.
- a winding module for an electric machine comprises a flat field winding that is angled at an end turn, wherein a vertex of the flat field winding is aligned with an axis of rotation.
- the vertex provides a predetermined axial offset so as to compensate for a radial expansion of the flat field winding when it is disposed to a centrifugal force.
- FIG. 1 illustrates a generator rotor assembly including a one-piece rotor forging and end winding modules with curved ends;
- FIG. 2 illustrates a flat winding component of the present invention
- FIG. 3 illustrates an example using a three-coil winding
- FIG. 4 is an assembly drawing of a generator rotor accommodating the flat windings of the present invention.
- the rotor assembly of the noted co-pending U.S. Patent Application is shown in FIG. 1.
- the assembly includes a multi-pole magnetic core 32 (two-pole core shown) including spindles 33 and receiving a plurality of winding assemblies 34 , one for each pole.
- Corresponding pole faces 36 are formed at ends of the rotor forging.
- the winding assemblies 34 are slid over the parallel sided forging of the two-pole magnetic core 32 .
- These winding assemblies 34 are curved into an arc concentric with the spindles 33 to accommodate the spindles 33 . It is desirable, however, to flatten the winding construction for simplicity and to reduce associated manufacturing and assembly costs.
- FIG. 4 is an assembly drawing of a generator rotor of the present invention.
- the rotor forging is divided into at least three pieces including a rotor body 12 and a pair of generally tuning fork-shaped spindles 14 .
- the so-shaped spindles 14 define notches 16 therein.
- a winding module 18 includes a plurality of flat field windings 19 disposed end-to-end and include openings 20 therein that are sized to fit over the rotor body 12 .
- the end-to-end construction of the flat field windings 19 is formed using standard layered winding methods.
- each of the flat field windings 19 of the winding module 18 have a smaller perimeter at outside ends of the winding module 18 , tapering toward a largest perimeter at a middle of the winding module 18 .
- the flat field windings 19 are typically comprise copper windings.
- the electric machine (not shown), comprising winding module 18 , is typically cooled by air, Hydrogen gas or water.
- the operating temperature of the winding module is typically in the range between about ⁇ 45° C. and about 160° C. Such operating temperature is typically dictated by the electrical insulation performance and rotor dynamic behavior of the electric machine.
- typical superconducting electric machines operate in cryogenic temperatures where a superconducting conductor reaches zero electrical resistance. As such, these typical superconducting electric machines typically operate in the range between about 4K (about ⁇ 270° C.) and about 77K (about ⁇ 196° C.).
- FIG. 2 illustrates the flat field winding 19 of the winding module 18 of the present invention.
- the flat field winding 19 includes a shallow angle 19 A in each end turn including a vertex 19 B that is aligned with an axis of rotation 21 of the rotor field.
- the shallow angle 19 A in each end turn along with each respective vertex 19 B define a predetermined axial offset that allows the end arms to lengthen and shorten with changes in rotor speed and temperature, without suffering structural damage because of excessive elongation of the flat field windings 19 .
- predetermined axial offset refers to a predetermined angle (designated “A” in drawing FIG.
- the predetermined axial offset serves to compensate for a radial tolerance of the winding module 18 so as to fit into a structural support enclosure (not shown), typically a cylindrical enclosure, during assembly.
- a structural support enclosure typically a cylindrical enclosure
- FIG. 3 illustrates an example using a three-coil winding with optional end winding blocking in the axial direction.
- Blocks 22 are inserted between the flat field windings or coils 19 along an axis of symmetry filling the space between the rotor body 12 and the brace that bridges the legs of the spindles 14 .
- a spring 24 is inserted between the spindles 14 and an outermost one of the blocks 22 as shown. The spring 24 maintains the compression in the blocking as the axial arms of the winding expand with acceleration of the rotor to running speed.
- the winding module 18 is fit over the parallel sides of the rotor body 12 with the spindles 14 separated from the rotor body 12 . Once in place, the spindles 14 are secured to the rotor body by screws 23 or the like. The notch 16 in the spindles is sized to receive the ends 18 A of the winding module 18 . After fitting the winding module 18 over the parallel sides of the rotor body 12 , the spindles 14 are secured to rotor body 12 via screws 23 , and the outside surfaces of the spindles are substantially flush with the corresponding surfaces of the rotor body 12 .
- a winding module 18 incorporating flat field windings 19 including a predetermined axial offset allows the end arms of the flat field windings 19 to lengthen and shorten with changes in motor speed, without suffering elongation.
- the predetermined axial offset serves to minimize the winding stresses in different operating conditions.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Synchronous Machinery (AREA)
- Superconductive Dynamoelectric Machines (AREA)
Abstract
Description
- This application is a continuation-in-part of copending U.S. application Ser. No. 09/684,485, filed Oct. 10, 2000, which claims priority to and the benefit of the filing date of U.S. Provisional Application Serial No. 60/169,242, filed Dec. 6, 1999, the entire content of which are herein incorporated by reference.
- The present invention relates to rotational electric machines and, more particularly, to a multi-piece two-pole generator rotor including flat for machine fields.
- In electric machines having a rotor and a stator, the rotor is provided with field windings, and the stator is provided with armature windings. The rotor is typically provided with rotor spindles to effect rotation. With this structure, however, the spindles on each end of the rotor body require the ends of the field winding to be formed into an arc concentric with the spindle. See, e.g., FIG. 1. This rotor construction including a one-piece rotor forging and end winding modules having curved ends is described in co-pending U.S. patent application Ser. No. 09/491,504, filed Jan. 26, 2000.
- It is desirable to flatten the winding construction of the prior end winding modules and eliminate the arcs required for concentricity with the spindle. A flattened winding construction is described in U.S. Pat. No. 6,437,476. Flat windings with straight end turns extending diametrically across the rotor, however, are susceptible to elongation under the pull of centrifugal forces. The introduction of a predetermined axial offset can allow the end arms to lengthen and shorten with changes in rotor speed, without suffering elongation. On the other hand, the unsupported end arm will be subject to minimum induced centrifugal forces and effect support from the straight section of the winding.
- In an exemplary embodiment of the invention, a winding module for an electric machine comprises a flat field winding that is angled at an end turn, wherein a vertex of the flat field winding is aligned with an axis of rotation. The vertex provides a predetermined axial offset so as to compensate for a radial expansion of the flat field winding when it is disposed to a centrifugal force.
- FIG. 1 illustrates a generator rotor assembly including a one-piece rotor forging and end winding modules with curved ends;
- FIG. 2 illustrates a flat winding component of the present invention;
- FIG. 3 illustrates an example using a three-coil winding; and
- FIG. 4 is an assembly drawing of a generator rotor accommodating the flat windings of the present invention.
- The rotor assembly of the noted co-pending U.S. Patent Application is shown in FIG. 1. The assembly includes a multi-pole magnetic core32 (two-pole core shown) including
spindles 33 and receiving a plurality ofwinding assemblies 34, one for each pole. Correspondingpole faces 36 are formed at ends of the rotor forging. As shown, thewinding assemblies 34 are slid over the parallel sided forging of the two-polemagnetic core 32. Thesewinding assemblies 34 are curved into an arc concentric with thespindles 33 to accommodate thespindles 33. It is desirable, however, to flatten the winding construction for simplicity and to reduce associated manufacturing and assembly costs. - FIG. 4 is an assembly drawing of a generator rotor of the present invention. As shown, the rotor forging is divided into at least three pieces including a
rotor body 12 and a pair of generally tuning fork-shaped spindles 14. The so-shaped spindles 14 definenotches 16 therein. Awinding module 18 includes a plurality offlat field windings 19 disposed end-to-end and includeopenings 20 therein that are sized to fit over therotor body 12. The end-to-end construction of theflat field windings 19 is formed using standard layered winding methods. As shown, each of theflat field windings 19 of thewinding module 18 have a smaller perimeter at outside ends of thewinding module 18, tapering toward a largest perimeter at a middle of thewinding module 18. In one embodiment, theflat field windings 19 are typically comprise copper windings. The electric machine (not shown), comprisingwinding module 18, is typically cooled by air, Hydrogen gas or water. In addition, the operating temperature of the winding module is typically in the range between about −45° C. and about 160° C. Such operating temperature is typically dictated by the electrical insulation performance and rotor dynamic behavior of the electric machine. By contrast, typical superconducting electric machines operate in cryogenic temperatures where a superconducting conductor reaches zero electrical resistance. As such, these typical superconducting electric machines typically operate in the range between about 4K (about −270° C.) and about 77K (about −196° C.). - FIG. 2 illustrates the flat field winding19 of the
winding module 18 of the present invention. The flat field winding 19 includes ashallow angle 19A in each end turn including avertex 19B that is aligned with an axis ofrotation 21 of the rotor field. Theshallow angle 19A in each end turn along with eachrespective vertex 19B define a predetermined axial offset that allows the end arms to lengthen and shorten with changes in rotor speed and temperature, without suffering structural damage because of excessive elongation of theflat field windings 19. As used herein, the term “predetermined axial offset” refers to a predetermined angle (designated “A” in drawing FIG. 2) defining an offset predetermined for a radial expansion range of the flat field winding 19 wherein such expansion is typically created when theflat field windings 19 are disposed to centrifugal forces during operation. In addition, the predetermined axial offset serves to compensate for a radial tolerance of thewinding module 18 so as to fit into a structural support enclosure (not shown), typically a cylindrical enclosure, during assembly. As such, it will be appreciated that the predetermined axial offset construction serves to minimize the winding stresses in thewinding module 18 in different manufacturing and operating conditions. - FIG. 3 illustrates an example using a three-coil winding with optional end winding blocking in the axial direction.
Blocks 22 are inserted between the flat field windings orcoils 19 along an axis of symmetry filling the space between therotor body 12 and the brace that bridges the legs of thespindles 14. Aspring 24 is inserted between thespindles 14 and an outermost one of theblocks 22 as shown. Thespring 24 maintains the compression in the blocking as the axial arms of the winding expand with acceleration of the rotor to running speed. - The
winding module 18 is fit over the parallel sides of therotor body 12 with thespindles 14 separated from therotor body 12. Once in place, thespindles 14 are secured to the rotor body byscrews 23 or the like. Thenotch 16 in the spindles is sized to receive theends 18A of thewinding module 18. After fitting thewinding module 18 over the parallel sides of therotor body 12, thespindles 14 are secured torotor body 12 viascrews 23, and the outside surfaces of the spindles are substantially flush with the corresponding surfaces of therotor body 12. - With the structure of the present invention, a
winding module 18 incorporatingflat field windings 19 including a predetermined axial offset allows the end arms of theflat field windings 19 to lengthen and shorten with changes in motor speed, without suffering elongation. Moreover, the predetermined axial offset serves to minimize the winding stresses in different operating conditions. - While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/254,727 US6844655B2 (en) | 1999-12-06 | 2002-09-25 | Expandable flat winding for rotating electric machine fields |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16924299P | 1999-12-06 | 1999-12-06 | |
US68448500A | 2000-10-10 | 2000-10-10 | |
US10/254,727 US6844655B2 (en) | 1999-12-06 | 2002-09-25 | Expandable flat winding for rotating electric machine fields |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US68448500A Continuation-In-Part | 1999-12-06 | 2000-10-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030020361A1 true US20030020361A1 (en) | 2003-01-30 |
US6844655B2 US6844655B2 (en) | 2005-01-18 |
Family
ID=26864895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/254,727 Expired - Fee Related US6844655B2 (en) | 1999-12-06 | 2002-09-25 | Expandable flat winding for rotating electric machine fields |
Country Status (4)
Country | Link |
---|---|
US (1) | US6844655B2 (en) |
EP (1) | EP1107430A3 (en) |
JP (1) | JP2001190041A (en) |
RU (1) | RU2253175C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090230809A1 (en) * | 2006-03-07 | 2009-09-17 | Allied Motion Technologies Inc. | Stator winding for a slotless motor |
US8346326B2 (en) | 2008-01-17 | 2013-01-01 | General Electric Company | Superconductive wire, processes of manufacture and uses thereof |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8339011B2 (en) * | 2009-12-07 | 2012-12-25 | Hamilton Sundstrand Corporation | Rotor assembly wire support |
US9893584B2 (en) * | 2015-06-24 | 2018-02-13 | Hamilton Sundstrand Corporation | End winding support for an electric generator |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2844746A (en) * | 1956-02-17 | 1958-07-22 | Gen Electric | Support means for rotor end windings of dynamoelectric machines |
US5548168A (en) * | 1994-06-29 | 1996-08-20 | General Electric Company | Superconducting rotor for an electrical machine |
US5644179A (en) * | 1994-12-19 | 1997-07-01 | General Electric Company | Gas cooled end turns for dynamoelectric machine rotor |
US5785114A (en) * | 1996-02-23 | 1998-07-28 | Westinghouse Electric Corporation | Integral hydrogen cooler assembly for electric generators |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2295019A (en) * | 1939-10-31 | 1942-09-08 | Milton E Thompson | Electrodynamic brake |
US3816780A (en) * | 1972-08-18 | 1974-06-11 | Massachusetts Inst Technology | Rotor structure for supercooled field winding |
US3999091A (en) * | 1974-11-13 | 1976-12-21 | Massachusetts Institute Of Technology | Superconducting machine having wound damper-shield winding |
US3991333A (en) * | 1975-08-20 | 1976-11-09 | General Electric Company | Winding support structure for superconducting rotor |
SE395991B (en) * | 1975-12-17 | 1977-08-29 | Asea Ab | ROTOR FOR TURBO GENERATOR |
US4277705A (en) * | 1977-09-02 | 1981-07-07 | Electric Power Research Institute | Method and apparatus for cooling a winding in the rotor of an electrical machine |
FR2465349A1 (en) * | 1979-09-14 | 1981-03-20 | Alsthom Atlantique | Salient pole for large electrical machines - has easily removable windings with interconnectors held by bolts (PT 6.3.81) |
US4614888A (en) * | 1983-08-17 | 1986-09-30 | Sundstrand Corporation | Improved magnetic rotor |
US5432391A (en) * | 1994-03-21 | 1995-07-11 | General Electric Company | Conformable dynamoelectric machine field distance blocks and methods of installation |
JPH088005A (en) * | 1994-06-15 | 1996-01-12 | Itoki Crebio Corp | Plug socket device for desk |
JPH0880005A (en) * | 1994-09-07 | 1996-03-22 | Toshiba Corp | Method for fixing field coil and dynamo-electric machine |
-
2000
- 2000-11-30 EP EP00310653A patent/EP1107430A3/en not_active Ceased
- 2000-12-05 JP JP2000369524A patent/JP2001190041A/en active Pending
- 2000-12-05 RU RU2000130593/09A patent/RU2253175C2/en not_active IP Right Cessation
-
2002
- 2002-09-25 US US10/254,727 patent/US6844655B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2844746A (en) * | 1956-02-17 | 1958-07-22 | Gen Electric | Support means for rotor end windings of dynamoelectric machines |
US5548168A (en) * | 1994-06-29 | 1996-08-20 | General Electric Company | Superconducting rotor for an electrical machine |
US5644179A (en) * | 1994-12-19 | 1997-07-01 | General Electric Company | Gas cooled end turns for dynamoelectric machine rotor |
US5785114A (en) * | 1996-02-23 | 1998-07-28 | Westinghouse Electric Corporation | Integral hydrogen cooler assembly for electric generators |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090230809A1 (en) * | 2006-03-07 | 2009-09-17 | Allied Motion Technologies Inc. | Stator winding for a slotless motor |
US7915779B2 (en) * | 2006-03-07 | 2011-03-29 | Allied Motion Technologies, Inc. | Stator winding for a slotless motor |
US8346326B2 (en) | 2008-01-17 | 2013-01-01 | General Electric Company | Superconductive wire, processes of manufacture and uses thereof |
Also Published As
Publication number | Publication date |
---|---|
US6844655B2 (en) | 2005-01-18 |
EP1107430A3 (en) | 2003-10-29 |
EP1107430A2 (en) | 2001-06-13 |
JP2001190041A (en) | 2001-07-10 |
RU2253175C2 (en) | 2005-05-27 |
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Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAMINSKI, CHRISTOPHER ANTHONY;NYGARD, ROBERT JOHN;WANG, YU (NMN);REEL/FRAME:013342/0191 Effective date: 20020924 |
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Effective date: 20130118 |